3(2x-6)=21

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Solution for 3(2x-6)=21 equation: 



3(2x-6)=21

We move all terms to the left:

3(2x-6)-(21)=0

We multiply parentheses

6x-18-21=0

We add all the numbers together, and all the variables

6x-39=0

We move all terms containing x to the left, all other terms to the right

6x=39

x=39/6

x=6+1/2

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